<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>04_列表排序</title>
    <!-- 引入Vue -->
    <script type="text/javascript" src="../js/vue.js"></script>

</head>
<body>

    <!-- 准备好一个容器 -->
    <div id="root">
        <!-- 遍历数组 -->
        <h2>人员列表</h2>
        <input type="text" placeholder="请输入名字" v-model="keyword">
        <button @click="sortType = 2">年龄升序</button>
        <button @click="sortType = 1">年龄降序</button>
        <button @click="sortType = 0">原顺序</button>
        <ul>
            <li v-for="(person,index) in filPersons" :key="person.id">
                {{person.name}} - {{person.age}} - {{person.sex}}
            </li>
        </ul>

       
    </div>

</body>
    <script type="text/javascript">
        
        //用计算属性实现
        new Vue({
            el:'#root',
            data:{
                keyword:'',
                sortType:0,   //0代表原顺序  1：代表降序   2：代表升序  
                persons:[
                    {id:'001',name:'马冬梅',age:30, sex:'女'},
                    {id:'002',name:'周冬雨',age:20, sex:'女'},
                    {id:'003',name:'周杰伦',age:21, sex:'男'},
                    {id:'004',name:'温兆伦',age:18, sex:'男'}
                ],  
                
            },
            computed:{
                filPersons(){

                    const arr =  this.persons.filter((p) => {
                        return p.name.indexOf(this.keyword) !== -1
                    })

                    //判断一下是否需要排序
                    if(this.sortType){
                        arr.sort((p1,p2) => {
                            return this.sortType === 1 ? p2.age - p1.age : p1.age - p2.age;
                        })
                    }

                    return arr;
                }
            }
        })  

    </script>

</html>